[!!!][TASK] Show folder modification date in file list

Show the modification date of folders in the "Last Modified" column in
filelist again, which has been removed with the introduction of FAL.

Resolves: #65165
Releases: master
Change-Id: Ie8f615eaa1eaed27f2a869e55ca220668ce94663
Reviewed-on: https://review.typo3.org/37017


Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>